new auto-extend strategy for CxBuffer - resolves #641

adds cxBufferShrink() - resolves #626

fixes missing cx_attr_export - relates to #642

fixes errno value after failing cxBufferSeek() to be consistently EINVAL

adds cxListSet() - resolves #642

fixes that cx_tree_search() did not investigate subtrees with equally good distance

fix allocator of some printf.h functions not being const - fixes #611

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